4945561 has 4 divisors (see below), whose sum is σ = 4966324. Its totient is φ = 4924800.

The previous prime is 4945553. The next prime is 4945579. The reversal of 4945561 is 1655494.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3459600 + 1485961 = 1860^2 + 1219^2 .

It is a cyclic number.

It is not a de Polignac number, because 4945561 - 2³ = 4945553 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4945511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10020 + ... + 10501.

It is an arithmetic number, because the mean of its divisors is an integer number (1241581).

Almost surely, 2^4945561 is an apocalyptic number.

It is an amenable number.

4945561 is a deficient number, since it is larger than the sum of its proper divisors (20763).

4945561 is a wasteful number, since it uses less digits than its factorization.

4945561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20762.

The product of its digits is 21600, while the sum is 34.

The square root of 4945561 is about 2223.8617313133. The cubic root of 4945561 is about 170.3747327660.

Subtracting from 4945561 its product of digits (21600), we obtain a square (4923961 = 2219²).

The spelling of 4945561 in words is "four million, nine hundred forty-five thousand, five hundred sixty-one".